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x in (-oo:+oo)
7 = 2*(x-(1/2)) // - 2*(x-(1/2))
7-(2*(x-(1/2))) = 0
7-2*(x-1/2) = 0
7-2*(x-1/2) = 0
8-2*x = 0
8-2*x = 0
8-2*x = 0 // - 8
-2*x = -8 // : -2
x = -8/(-2)
x = 4
x = 4
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